package com.stylefeng.guns.modular.model.utils;
import org.apache.commons.codec.binary.Base64; 
import org.bouncycastle.jce.provider.BouncyCastleProvider;

import org.bouncycastle.jce.provider.BouncyCastleProvider;

import javax.crypto.BadPaddingException; 
import javax.crypto.Cipher; 
import javax.crypto.IllegalBlockSizeException; 
import javax.crypto.NoSuchPaddingException; 
import javax.crypto.spec.IvParameterSpec; 
import javax.crypto.spec.SecretKeySpec; 

import java.io.UnsupportedEncodingException; 
import java.security.*; 
import java.security.spec.InvalidParameterSpecException; 
import java.util.Arrays;

/** 
 * Created by lsh 
 * AES-128-CBC 加密方式 
 * 注： 
 * AES-128-CBC可以自己定义“密钥”和“偏移量“。 
 * AES-128是jdk自动生成的“密钥”。 
 */
public class AesCbcUtil { 


  static {
    //BouncyCastle是一个开源的加解密解决方案，主页在http://www.bouncycastle.org/
  //  Security.addProvider(new BouncyCastleProvider());
  }

  /**
   * AES解密
   *
   * @param data      //密文，被加密的数据
   * @param key      //秘钥
   * @param iv       //偏移量
   * @param encodingFormat //解密后的结果需要进行的编码
   * @return
   * @throws Exception (encryptedData, session_key, iv, "UTF-8");
   */
  public static String decrypt(String data, String key, String iv, String encodingFormat) throws Exception {
//    initialize();

    //被加密的数据
    byte[] dataByte = Base64.decodeBase64(data);
    //加密秘钥
    byte[] keyByte = Base64.decodeBase64(key);
    //偏移量
    byte[] ivByte = Base64.decodeBase64(iv);


    try {
      Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");

      SecretKeySpec spec = new SecretKeySpec(keyByte, "AES");

      AlgorithmParameters parameters = AlgorithmParameters.getInstance("AES");
      parameters.init(new IvParameterSpec(ivByte));

      cipher.init(Cipher.DECRYPT_MODE, spec, parameters);// 初始化

      byte[] resultByte = cipher.doFinal(dataByte);
      if (null != resultByte && resultByte.length > 0) {
        String result = new String(resultByte, encodingFormat);
        return result;
      }
      return null;
    } catch (NoSuchAlgorithmException e) {
      e.printStackTrace();
    } catch (NoSuchPaddingException e) {
      e.printStackTrace();
    } catch (InvalidParameterSpecException e) {
      e.printStackTrace();
    } catch (InvalidKeyException e) {
      e.printStackTrace();
    } catch (InvalidAlgorithmParameterException e) {
      e.printStackTrace();
    } catch (IllegalBlockSizeException e) {
      e.printStackTrace();
    } catch (BadPaddingException e) {
      e.printStackTrace();
    } catch (UnsupportedEncodingException e) {
      e.printStackTrace();
    }

    return null;
  }

	

//	public static boolean initialized = false;
//
//	public static final String ALGORITHM = "AES/ECB/PKCS7Padding";
//
////	/**
////	 * @param  String str  要被加密的字符串
////	 * @param  byte[] key  加/解密要用的长度为32的字节数组（256位）密钥
////	 * @return byte[]  加密后的字节数组
////	 */
//	public static byte[] Aes256Encode(String str, byte[] key){
//		initialize();
//		byte[] result = null;
//		try{
//			Cipher cipher = Cipher.getInstance(ALGORITHM, "BC");
//			SecretKeySpec keySpec = new SecretKeySpec(key, "AES"); //生成加密解密需要的Key
//			cipher.init(Cipher.ENCRYPT_MODE, keySpec);
//			result = cipher.doFinal(str.getBytes("UTF-8"));
//		}catch(Exception e){
//			e.printStackTrace();
//		}
//		return result;
//	}
//
////	/**
////	 * @param  byte[] bytes  要被解密的字节数组
////	 * @param  byte[] key    加/解密要用的长度为32的字节数组（256位）密钥
////	 * @return String  解密后的字符串
////	 */
//	public static String decrypt(String data, String keys, String iv, String encodingFormat){
//	    //被加密的数据
//	    byte[] bytes = Base64.decodeBase64(data);
//	    //加密秘钥
//	    byte[] key = Base64.decodeBase64(keys);
//	    //偏移量
//	    byte[] ivByte = Base64.decodeBase64(iv);
//		initialize();
//		String result = null;
//		try{
//			Cipher cipher = Cipher.getInstance(ALGORITHM);
//			SecretKeySpec keySpec = new SecretKeySpec(key, "AES"); //生成加密解密需要的Key
//			cipher.init(Cipher.DECRYPT_MODE, keySpec);
//			byte[] decoded = cipher.doFinal(bytes);
//			result = new String(decoded, "UTF-8");
//		}catch(Exception e){
//			e.printStackTrace();
//		}
//		return result;
//	}
//
//	public static void initialize(){
//		if (initialized) return;
//		Security.addProvider(new BouncyCastleProvider());
//		initialized = true;
//	}

	
} 
